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Bent threaded steerer - input appreciated

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Bent threaded steerer - input appreciated

Old 07-07-24, 06:08 PM
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Bent threaded steerer - input appreciated

Pics will be attached below but for additional info;
- I ran straightedges all over the top, down and head tube and no buckling I can see or feel. Lugged steel frame, Columbus SL main (I think). (Schwinn Circuit if someone knows or wants to look it up.)
- Headset and crown race, very brief inspection so far, seem fine.
- Fork is stamped Tange 7B.
- Stem and headset came apart with no issues.

Options as I see it
- Bin the F/F/HS. Better safe than sorry, lawyers, etc
- Braise new steerer in and check alignment.
- Cross fingers and hopefully find 2nd hand fork that has correct dimensions.

FWIW - no sentimental attachment or anything like that. I hate tossing a useable thing into the scrap bin.

Also, Iím not a frame builder but opinions from yíall have merit and yes, I have reasonable understanding that opinions are going to be all over the place.




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Old 07-08-24, 05:36 AM
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That's a somewhat unusual way for a fork to be damaged. I have seen it before though. It's hard to tell, but is it possible the crown is also bent?

We were just discussing this recently here. A couple of us have forks that need new steerers, but it is a project we never get around to actually doing. The way the steerer is bent makes replacement somewhat more difficult.
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Old 07-08-24, 05:41 AM
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I would find a similar fork and have that decal reproduced.
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Old 07-08-24, 06:19 AM
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replace the fork
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Old 07-08-24, 06:38 AM
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I did some more sleuthing and the head tube is bulged at the top on the right and left sides. Not easy to see on a flat black frame but it can be felt and with the headset out it was easier to get a straight edge in there to verify the damage. If anyone needs a wall hangerÖ

On a positive note, the Suntour Sprint groupset is in very good shape so that is excellent news. Just to be cautious Iím thinking I should bin the headset.
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Old 07-08-24, 08:59 AM
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Originally Posted by RustyJames
Pics will be attached below but for additional info;

- Bin the F/F/HS. Better safe than sorry, lawyers, etc

Also, Iím not a frame builder but opinions from yíall have merit and yes, I have reasonable understanding that opinions are going to be all over the place.


I agree with replacing the fork. SOMA sells many, many styles and sizes of steel forks at a reasonable price.
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Old 07-08-24, 09:58 AM
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Alrighty - the fork can be replaced if necessary should I go the route.

The frame - there is definitely some wonkiness in the head tube. My digital calipers are showing a ~1mm variation side to side and front to back. There is a definite lip inside the headtube where the lug ends on the outside. It appears the top tube was jammed into the head tube. This is also apparent on the outside. PicsÖ




gotta recheck the down tube for straightness.
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Old 07-08-24, 10:13 AM
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Last check - top tube definitely has a sag.

Can this be aligned out?

At this point, Iím looking for a reason not to scrap the frame.
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Old 07-08-24, 11:04 AM
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I think most actual builders in this forum are tell you to scrap the frame. Maybe you'll get other opinions if someone from C&V wanders in. It's probably okay to ride around town once you get a fork.
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Old 07-08-24, 11:44 AM
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I agree with unter... make a city errands bike out of it. Put a big basket on the front, have fun with it in a different way. Let it wear its scars and still be useable.
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Old 07-08-24, 12:09 PM
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Originally Posted by RB1-luvr
I agree with unter... make a city errands bike out of it. Put a big basket on the front, have fun with it in a different way. Let it wear its scars and still be useable.
I agree that this is its best use now. Otherwise, it's toast.
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Old 07-08-24, 03:55 PM
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Originally Posted by RB1-luvr
I agree with unter... make a city errands bike out of it. Put a big basket on the front, have fun with it in a different way. Let it wear its scars and still be useable.
Unless the steepened head angle reduces front-center to the point you have contact between shoe and tire (or fender). I don't mind toe overlap on a racer, but it's more annoying on a grocery-getter. You probably didn't steepen the HTA much (maybe not even measurable), but being a racer, the front-center might already be too short for a utility bike.

For that, 650b wheels might be a win-win — fatter tires for comfort, safety, not having to air-up as often, and not denting the rims if you put off airing-up a bit longer.

It means building or buying wheels, and longer-reach brakes, so not as cheap. You can easily find the longer brakes used and cheap, but used 650b wheels not so much, probably got to buy new.

Width between the chainstays will limit tire width, perhaps so much as to make the whole idea unappealing, unless you're willing to indent the stays for more tire clearance. If you have to go narrower than 38mm or so, the BB height might be getting annoyingly low. Pedal-stike in corners being the annoyance.

BTW I bought an all-chrome fork from SOMA (Tange-built) that's made for 650b, with bosses for canti or V-brake. It's a long-rake, so it will reduce your steering trail — controversial, some people love it. It will for sure reduce the chance of toe-overlap. I am happy with the build quality, and the chrome is really good.

Last edited by bulgie; 07-08-24 at 03:58 PM.
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Old 07-08-24, 08:42 PM
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bulgie I was going to tag you if you didnít chime in since you have encouraged some of my crazy stuff in the past.

The vibe Iím getting is to turn it into an urban frankenbike which is not out of the realm of possibilities. The stays look narrow so Iíll play around and see what fits. I may have the perfect wheel set - singlespeed bolt-ons but they are 700c.

All in the name of science
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Old 07-09-24, 01:03 AM
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Originally Posted by RustyJames
bulgie I was going to tag you if you didnít chime in
Tagging/mentioning someone doesn't work anymore or I should say, the person doesn't get an email like we used to. (That's what I mean by "doesn't work".) If I understand it right, the forum gods have taken that feature away, and it ain't coming back. Someone clue me in if that's wrong.

But I did not get an alert from being mentioned by RustyJames
RJ, did you get an alert from me mentioning you?
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Old 07-09-24, 07:56 AM
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Originally Posted by bulgie
Tagging/mentioning someone doesn't work anymore or I should say, the person doesn't get an email like we used to. (That's what I mean by "doesn't work".) If I understand it right, the forum gods have taken that feature away, and it ain't coming back. Someone clue me in if that's wrong.

But I did not get an alert from being mentioned by RustyJames
RJ, did you get an alert from me mentioning you?
Now that you mention it I only received a notification that you posted in the thread. I noticed the tagging looked different but I didnít know it didnít create an alert. Odd. Thanks for the heads up.
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Old 07-09-24, 08:11 AM
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I turned off all notifications the minute I got my first one. Couldn't turn off notifications for likes at that time, someone told me you can now.

They didn't really take the function away so much as they upgraded the software and the upgraded version doesn't have it for whatever reason. I think this may be the first time they did a major upgrade without trashing the forum for a while. So that's good at least. There is some complaining going on in the forum suggestions subforum. https://www.bikeforums.net/forum-sug...er-assistance/
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Old 07-10-24, 05:49 PM
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RustyJames
There are too many good frames out there to bother with trying to save this one. Trash it and save yourself any grief about a potential failure. If you want something to build get my Lemond frame and build it up. Smiles, MH
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Old 07-11-24, 08:56 AM
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Originally Posted by Mad Honk
RustyJames
There are too many good frames out there to bother with trying to save this one. Trash it and save yourself any grief about a potential failure. If you want something to build get my Lemond frame and build it up. Smiles, MH
Thank you for the offer Dave but I dragged the Circuit home because worst case scenario, I could scavenge some parts which has turned out to be my situation.
I agree about binning the frame. I have city/errand bikes and the thought of me or someone else using my damaged frame and experiencing a failure would cause me to lose sleep.
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Old 07-11-24, 09:08 AM
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RATS!... The Frame and Fork are TOAST!


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